// reflectSliceWithProperType does the opposite thing as setSliceWithProperType.
func reflectSliceWithProperType(key *Key, field reflect.Value, delim string) error {
slice := field.Slice(0, field.Len())
if field.Len() == 0 {
return nil
}
var buf bytes.Buffer
sliceOf := field.Type().Elem().Kind()
for i := 0; i < field.Len(); i++ {
switch sliceOf {
case reflect.String:
buf.WriteString(slice.Index(i).String())
case reflect.Int, reflect.Int64:
buf.WriteString(fmt.Sprint(slice.Index(i).Int()))
case reflect.Uint, reflect.Uint64:
buf.WriteString(fmt.Sprint(slice.Index(i).Uint()))
case reflect.Float64:
buf.WriteString(fmt.Sprint(slice.Index(i).Float()))
case reflectTime:
buf.WriteString(slice.Index(i).Interface().(time.Time).Format(time.RFC3339))
default:
return fmt.Errorf("unsupported type '[]%s'", sliceOf)
}
buf.WriteString(delim)
}
key.SetValue(buf.String()[:buf.Len()-1])
return nil
}
func decComplex128Array(state *decoderState, v reflect.Value, length int, ovfl error) bool {
// Can only slice if it is addressable.
if !v.CanAddr() {
return false
}
return decComplex128Slice(state, v.Slice(0, v.Len()), length, ovfl)
}
func (p *printer) marshalSimple(typ reflect.Type, val reflect.Value) (string, []byte, error) {
switch val.Kind() {
case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
return strconv.FormatInt(val.Int(), 10), nil, nil
case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uintptr:
return strconv.FormatUint(val.Uint(), 10), nil, nil
case reflect.Float32, reflect.Float64:
return strconv.FormatFloat(val.Float(), 'g', -1, val.Type().Bits()), nil, nil
case reflect.String:
return val.String(), nil, nil
case reflect.Bool:
return strconv.FormatBool(val.Bool()), nil, nil
case reflect.Array:
if typ.Elem().Kind() != reflect.Uint8 {
break
}
// [...]byte
var bytes []byte
if val.CanAddr() {
bytes = val.Slice(0, val.Len()).Bytes()
} else {
bytes = make([]byte, val.Len())
reflect.Copy(reflect.ValueOf(bytes), val)
}
return "", bytes, nil
case reflect.Slice:
if typ.Elem().Kind() != reflect.Uint8 {
break
}
// []byte
return "", val.Bytes(), nil
}
return "", nil, &UnsupportedTypeError{typ}
}
func (f *Field) Unpack(buf []byte, val reflect.Value, length int, options *Options) error {
typ := f.Type.Resolve(options)
if typ == Pad || f.kind == reflect.String {
if typ == Pad {
return nil
} else {
val.SetString(string(buf))
return nil
}
} else if f.Slice {
if val.Cap() < length {
val.Set(reflect.MakeSlice(val.Type(), length, length))
} else if val.Len() < length {
val.Set(val.Slice(0, length))
}
// special case byte slices for performance
if !f.Array && typ == Uint8 && f.defType == Uint8 {
copy(val.Bytes(), buf[:length])
return nil
}
pos := 0
size := typ.Size()
for i := 0; i < length; i++ {
if err := f.unpackVal(buf[pos:pos+size], val.Index(i), 1, options); err != nil {
return err
}
pos += size
}
return nil
} else {
return f.unpackVal(buf, val, length, options)
}
}
// grow grows the slice s so that it can hold extra more values, allocating
// more capacity if needed. It also returns the old and new slice lengths.
func grow(s reflect.Value, extra int) (reflect.Value, int, int) {
i0 := s.Len()
i1 := i0 + extra
if i1 < i0 {
panic("reflect.Append: slice overflow")
}
m := s.Cap()
if i1 <= m {
return s.Slice(0, i1), i0, i1
}
if m == 0 {
m = extra
} else {
for m < i1 {
if i0 < 1024 {
m += m
} else {
m += m / 4
}
}
}
t := reflect.MakeSlice(s.Type(), i1, m)
reflect.Copy(t, s)
return t, i0, i1
}
func (d *decoder) sequence(n *node, out reflect.Value) (good bool) {
l := len(n.children)
var iface reflect.Value
switch out.Kind() {
case reflect.Slice:
out.Set(reflect.MakeSlice(out.Type(), l, l))
case reflect.Interface:
// No type hints. Will have to use a generic sequence.
iface = out
out = settableValueOf(make([]interface{}, l))
default:
d.terror(n, yaml_SEQ_TAG, out)
return false
}
et := out.Type().Elem()
j := 0
for i := 0; i < l; i++ {
e := reflect.New(et).Elem()
if ok := d.unmarshal(n.children[i], e); ok {
out.Index(j).Set(e)
j++
}
}
out.Set(out.Slice(0, j))
if iface.IsValid() {
iface.Set(out)
}
return true
}
func encodeByteArray(b []byte, v reflect.Value) []byte {
n := v.Len()
if n < (0xec - 0xe0) {
b = append(b, byte(0xe0+n))
} else {
b = encodeK4(b, 0xec, uint64(n))
}
// Fast path for when the array is addressable (which it almost
// always will be).
if v.CanAddr() {
return append(b, v.Slice(0, n).Bytes()...)
}
i := len(b)
j := i + n
if j > cap(b) {
t := make([]byte, i, j)
copy(t, b)
b = t
}
reflect.Copy(reflect.ValueOf(b[i:j]), v)
return b[:j]
}
func Slice(expectedSlice reflect.Value, actualSlice reflect.Value) (bool, diff.Difference) {
for i := 0; i < actualSlice.Len(); i++ {
if i >= expectedSlice.Len() {
return false, diff.SliceExtraElements{
ExtraElements: actualSlice.Slice(i, actualSlice.Len()),
AllElements: actualSlice,
}
}
equal, difference := Compare(expectedSlice.Index(i).Interface(), actualSlice.Index(i).Interface())
if !equal {
return false, diff.SliceNested{
Index: i,
NestedDifference: difference,
}
}
}
if expectedSlice.Len() > actualSlice.Len() {
return false, diff.SliceMissingElements{
MissingElements: expectedSlice.Slice(actualSlice.Len(), expectedSlice.Len()),
AllElements: actualSlice,
}
}
return true, diff.NoDifference{}
}
// reflectWithProperType does the opposite thing with setWithProperType.
func reflectWithProperType(t reflect.Type, key *Key, field reflect.Value, delim string) error {
switch t.Kind() {
case reflect.String:
key.SetValue(field.String())
case reflect.Bool,
reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64,
reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64,
reflect.Float64,
reflectTime:
key.SetValue(fmt.Sprint(field))
case reflect.Slice:
vals := field.Slice(0, field.Len())
if field.Len() == 0 {
return nil
}
var buf bytes.Buffer
isTime := fmt.Sprint(field.Type()) == "[]time.Time"
for i := 0; i < field.Len(); i++ {
if isTime {
buf.WriteString(vals.Index(i).Interface().(time.Time).Format(time.RFC3339))
} else {
buf.WriteString(fmt.Sprint(vals.Index(i)))
}
buf.WriteString(delim)
}
key.SetValue(buf.String()[:buf.Len()-1])
default:
return fmt.Errorf("unsupported type '%s'", t)
}
return nil
}
func decodeSliceValue(d *Decoder, v reflect.Value) error {
n, err := d.DecodeArrayLen()
if err != nil {
return err
}
if n == -1 {
v.Set(reflect.Zero(v.Type()))
return nil
}
if n == 0 && v.IsNil() {
v.Set(reflect.MakeSlice(v.Type(), 0, 0))
return nil
}
if v.Cap() >= n {
v.Set(v.Slice(0, n))
} else if v.Len() < v.Cap() {
v.Set(v.Slice(0, v.Cap()))
}
for i := 0; i < n; i++ {
if i >= v.Len() {
v.Set(growSliceValue(v, n))
}
sv := v.Index(i)
if err := d.DecodeValue(sv); err != nil {
return err
}
}
return nil
}
func encComplex64Array(state *encoderState, v reflect.Value) bool {
// Can only slice if it is addressable.
if !v.CanAddr() {
return false
}
return encComplex64Slice(state, v.Slice(0, v.Len()))
}
func (encoder *Encoder) encode(v reflect.Value) error {
switch v.Kind() {
case reflect.Map:
return encoder.encodeMap(v)
case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64:
return encoder.encodeUint(v.Uint())
case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
return encoder.encodeInt(v.Int())
case reflect.String:
return encoder.encodeString(v.String())
case reflect.Array:
v = v.Slice(0, v.Len())
return encoder.encodeSlice(v)
case reflect.Slice:
return encoder.encodeSlice(v)
case reflect.Float64, reflect.Float32:
return encoder.encodeFloat(v.Float())
case reflect.Interface:
v = reflect.ValueOf(v.Interface())
return encoder.encode(v)
case reflect.Ptr:
if v.IsNil() {
return encoder.encodeNull()
}
vv := reflect.Indirect(v)
if vv.Kind() == reflect.Struct {
return encoder.encodeStruct(v)
}
return encoder.encode(vv)
}
return errors.New("unsupported type:" + v.Type().String())
}
// encodeFixedArray writes the XDR encoded representation of each element
// in the passed array represented by the reflection value to the encapsulated
// writer and returns the number of bytes written. The ignoreOpaque flag
// controls whether or not uint8 (byte) elements should be encoded individually
// or as a fixed sequence of opaque data.
//
// A MarshalError is returned if any issues are encountered while encoding
// the array elements.
//
// Reference:
// RFC Section 4.12 - Fixed-Length Array
// Individually XDR encoded array elements
func (enc *Encoder) encodeFixedArray(v reflect.Value, ignoreOpaque bool) (int, error) {
// Treat [#]byte (byte is alias for uint8) as opaque data unless ignored.
if !ignoreOpaque && v.Type().Elem().Kind() == reflect.Uint8 {
// Create a slice of the underlying array for better efficiency
// when possible. Can't create a slice of an unaddressable
// value.
if v.CanAddr() {
return enc.EncodeFixedOpaque(v.Slice(0, v.Len()).Bytes())
}
// When the underlying array isn't addressable fall back to
// copying the array into a new slice. This is rather ugly, but
// the inability to create a constant slice from an
// unaddressable array is a limitation of Go.
slice := make([]byte, v.Len(), v.Len())
reflect.Copy(reflect.ValueOf(slice), v)
return enc.EncodeFixedOpaque(slice)
}
// Encode each array element.
var n int
for i := 0; i < v.Len(); i++ {
n2, err := enc.encode(v.Index(i))
n += n2
if err != nil {
return n, err
}
}
return n, nil
}
func DeleteSliceElementVal(sliceVal reflect.Value, idx int) reflect.Value {
if idx < 0 || idx >= sliceVal.Len() {
return sliceVal
}
before := sliceVal.Slice(0, idx)
after := sliceVal.Slice(idx+1, sliceVal.Len())
sliceVal = reflect.AppendSlice(before, after)
return sliceVal
}
func reflectAppend(i int, iface interface{}, slicev reflect.Value) reflect.Value {
iv := reflect.ValueOf(iface)
if slicev.Len() == i {
slicev = reflect.Append(slicev, iv)
slicev = slicev.Slice(0, slicev.Cap())
} else {
slicev.Index(i).Set(iv)
}
return slicev
}
// Sets the length of a slice by sub-slicing a slice that's too long,
// or appending empty fields if slice is too short.
func SetSliceLengh(slice reflect.Value, length int) reflect.Value {
if length > slice.Len() {
for i := slice.Len(); i < length; i++ {
slice = AppendEmptySliceField(slice)
}
} else if length < slice.Len() {
slice = slice.Slice(0, length)
}
return slice
}
// Create the pages we expect to see.
func wantedPages(vWant reflect.Value, pageSize int) []interface{} {
var pages []interface{}
for i, j := 0, pageSize; i < vWant.Len(); i, j = j, j+pageSize {
if j > vWant.Len() {
j = vWant.Len()
}
pages = append(pages, vWant.Slice(i, j).Interface())
}
return pages
}
func slicefmt(v reflect.Value) string {
length := v.Len()
slice := v.Slice(0, length)
str := "["
for i := 0; i < length; i += 1 {
str = fmt.Sprintf("%s%v, ", str, format(slice.Index(i)))
}
str += "\b\b]"
return fmt.Sprintf("%v(%s[%d])", str, v.Type().String(), length)
}
func nextSlice(s Stream, sliceValue reflect.Value, toInterface func(reflect.Value) interface{}) bool {
length := sliceValue.Len()
numCopied := copyToSlice(s, sliceValue, toInterface)
if numCopied == 0 {
return false
}
if numCopied < length {
sliceValue.Set(sliceValue.Slice(0, numCopied))
}
return true
}
func slicefmt(v reflect.Value) (string, string) {
length := v.Len()
slice := v.Slice(0, length)
str := "["
for i := 0; i < length; i += 1 {
v, _ := format(slice.Index(i))
str = fmt.Sprintf("%s%v, ", str, v)
}
str += "\b\b]"
return fmt.Sprintf("%v", str), fmt.Sprintf("%s[%d]", v.Type().String(), length)
}
func setString(slice reflect.Value, b []byte) {
switch slice.Kind() {
case reflect.Array, reflect.Slice:
reflect.Copy(slice.Slice(0, slice.Len()), reflect.ValueOf(b))
case reflect.String:
slice.SetString(string(b))
default:
panic("bad type for setString: " + slice.Kind().String())
}
}
func writeByteArray(val reflect.Value, w *encbuf) error {
if !val.CanAddr() {
// Slice requires the value to be addressable.
// Make it addressable by copying.
copy := reflect.New(val.Type()).Elem()
copy.Set(val)
val = copy
}
size := val.Len()
slice := val.Slice(0, size).Bytes()
w.encodeString(slice)
return nil
}
func (f *protoFuzzer) Fuzz(v reflect.Value) {
if !v.CanSet() {
return
}
switch v.Kind() {
case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
f.FuzzInt(v)
case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64:
f.FuzzUint(v)
case reflect.String:
str := ""
for i := 0; i < v.Len(); i++ {
str = str + string(' '+rune(f.r.Intn(94)))
}
v.SetString(str)
return
case reflect.Ptr:
if !v.IsNil() {
f.Fuzz(v.Elem())
}
return
case reflect.Slice:
mode := f.r.Intn(3)
switch {
case v.Len() > 0 && mode == 0:
// fuzz entry
f.Fuzz(v.Index(f.r.Intn(v.Len())))
case v.Len() > 0 && mode == 1:
// remove entry
entry := f.r.Intn(v.Len())
pre := v.Slice(0, entry)
post := v.Slice(entry+1, v.Len())
v.Set(reflect.AppendSlice(pre, post))
default:
// add entry
entry := reflect.MakeSlice(v.Type(), 1, 1)
f.Fuzz(entry) // XXX fill all fields
v.Set(reflect.AppendSlice(v, entry))
}
return
case reflect.Struct:
f.Fuzz(v.Field(f.r.Intn(v.NumField())))
return
case reflect.Map:
// TODO fuzz map
default:
panic(fmt.Sprintf("Not fuzzing %v %+v", v.Kind(), v))
}
}
func encodeByteArrayValue(e *Encoder, v reflect.Value) error {
if err := e.encodeBytesLen(v.Len()); err != nil {
return err
}
if v.CanAddr() {
b := v.Slice(0, v.Len()).Bytes()
return e.write(b)
}
b := make([]byte, v.Len())
reflect.Copy(reflect.ValueOf(b), v)
return e.write(b)
}
// decUint8Slice decodes a byte slice and stores in value a slice header
// describing the data.
// uint8 slices are encoded as an unsigned count followed by the raw bytes.
func decUint8Slice(i *decInstr, state *decoderState, value reflect.Value) {
n, ok := state.getLength()
if !ok {
errorf("bad %s slice length: %d", value.Type(), n)
}
if value.Cap() < n {
value.Set(reflect.MakeSlice(value.Type(), n, n))
} else {
value.Set(value.Slice(0, n))
}
if _, err := state.b.Read(value.Bytes()); err != nil {
errorf("error decoding []byte: %s", err)
}
}
func main() {
var a []int
var value reflect.Value = reflect.ValueOf(&a)
//判断指针是否指向内存地址
if !value.CanSet() {
value = value.Elem() //使指针指向内存地址
}
value = reflect.AppendSlice(value, reflect.ValueOf([]int{1, 2})) //支持切片
value = reflect.AppendSlice(value, reflect.ValueOf([]int{3, 4, 5, 6, 7, 8, 9})) //支持切片
fmt.Println(value.Kind(), value.Slice(0, value.Len()).Interface())
///// >> slice [1 2 3 4 5 6 7 8 9]
}
func (f *encFnInfo) kArray(rv reflect.Value) {
// We cannot share kSlice method, because the array may be non-addressable.
// E.g. type struct S{B [2]byte}; Encode(S{}) will bomb on "panic: slice of unaddressable array".
// So we have to duplicate the functionality here.
// f.e.encodeValue(rv.Slice(0, rv.Len()))
// f.kSlice(rv.Slice(0, rv.Len()))
l := rv.Len()
// Handle an array of bytes specially (in line with what is done for slices)
rtelem := f.ti.rt.Elem()
if rtelem.Kind() == reflect.Uint8 {
if l == 0 {
f.ee.encodeStringBytes(c_RAW, nil)
return
}
var bs []byte
if rv.CanAddr() {
bs = rv.Slice(0, l).Bytes()
} else {
bs = make([]byte, l)
for i := 0; i < l; i++ {
bs[i] = byte(rv.Index(i).Uint())
}
}
f.ee.encodeStringBytes(c_RAW, bs)
return
}
if f.ti.mbs {
if l%2 == 1 {
encErr("mapBySlice: invalid length (must be divisible by 2): %v", l)
}
f.ee.encodeMapPreamble(l / 2)
} else {
f.ee.encodeArrayPreamble(l)
}
if l == 0 {
return
}
for rtelem.Kind() == reflect.Ptr {
rtelem = rtelem.Elem()
}
fn := f.e.getEncFn(rtelem)
for j := 0; j < l; j++ {
// TODO: Consider perf implication of encoding odd index values as symbols if type is string
f.e.encodeValue(rv.Index(j), fn)
}
}
func DeleteEmptySliceElementsVal(sliceVal reflect.Value) reflect.Value {
if sliceVal.Kind() != reflect.Slice {
panic("Argument is not a slice: " + sliceVal.String())
}
zeroVal := reflect.Zero(sliceVal.Type().Elem())
for i := 0; i < sliceVal.Len(); i++ {
elemVal := sliceVal.Index(i)
if reflect.DeepEqual(elemVal.Interface(), zeroVal.Interface()) {
before := sliceVal.Slice(0, i)
after := sliceVal.Slice(i+1, sliceVal.Len())
sliceVal = reflect.AppendSlice(before, after)
i--
}
}
return sliceVal
}
func (e *Encoder) encodeBytes(v reflect.Value, ln int) error {
if ln <= 0xff {
e.WriteByte(0xc4)
e.WriteByte(byte(ln))
} else if ln <= 0xffff {
e.WriteByte(0xc5)
binary.Write(e.writer, binary.BigEndian, uint16(ln))
} else if ln <= 0xffffffff {
e.WriteByte(0xc6)
binary.Write(e.writer, binary.BigEndian, uint16(ln))
} else {
return fmt.Errorf("bytes overflow length: %d", ln)
}
e.writer.Write(v.Slice(0, ln).Bytes())
return nil
}
func decodeByteArray(b []byte, v reflect.Value) []byte {
var n uint64
switch k := b[0]; {
case k == 0x10:
return b[1:]
case 0xe0 <= k && k <= 0xeb:
n, b = uint64(k-0xe0), b[1:]
case 0xe0 <= k && k <= 0xef:
n, b = decodeK4(b, 0xec)
default:
throwf("binn: cannot unmarshal %s into %s", describe(b), v.Type())
}
copy(v.Slice(0, v.Len()).Bytes(), b[:n])
return b[n:]
}